NOVITRON INTERNATIONAL INC
SC 13D, 1999-12-06
LABORATORY ANALYTICAL INSTRUMENTS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934


                          NOVITRON INTERNATIONAL, INC.
                                (Name of Issuer)

                     COMMON STOCK, $.01 par value per share
                         (Title of class of securities)

                                    670088103
                                 (CUSIP NUMBER)

                               Third Security, LLC
                               The Governor Tyler
                               1902 Downey Street
                             Radford, Virginia 24141
                        Attention: Marcus E. Smith, Esq.
                           Telephone No.: 540-731-3344
           (Name, address and telephone number of person authorized to
                       receive notices and communications)

                                    Copy to:
                            John Owen Gwathmey, Esq.
                                Hunton & Williams
                          Riverfront Plaza, East Tower
                              951 East Byrd Street
                            Richmond, Virginia 23219


                                November 26, 1999
             (Date of event which requires filing of this statement)

              If the filing person has previously filed a statement
             on Schedule 13G to report the acquisition which is the
                subject of this Schedule 13D, and is filing this
                  schedule because of Rule 13d-1(b)(3) or (4),
                          check the following box [ ].

                               Page 1 of 21 Pages
<PAGE>

<TABLE>
<S>     <C>
- ------------------------------------------------------                              ------------------------------------------------
                                                                   13D
CUSIP NO.  670088103                                                                PAGE 2 OF 21 PAGES
- ------------------------------------------------------                              ------------------------------------------------
</TABLE>

<TABLE>
<S>     <C>
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
1          NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
              Randal J. Kirk                                    S.S. No.:  ###-##-####
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                          (a)      |_|
                                                                                                                      (b)      |_|
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
3          SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
4          SOURCE OF FUNDS*
              PF
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)                              |_|
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
6          CITIZENSHIP OR PLACE OF ORGANIZATION
              United States
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ------------------------------- --------- --------------------------------------------------------------------------- --------------
                                7         SOLE VOTING POWER
          NUMBER OF
                                --------- ---------------------------------------------------------------------------
                                --------- --------------------------------------------------------------------------- --------------
            SHARES              8         SHARED VOTING POWER
         BENEFICIALLY                        371,233
                                --------- ---------------------------------------------------------------------------
                                --------- --------------------------------------------------------------------------- --------------
           OWNED BY             9         SOLE DISPOSITIVE POWER
        EACH REPORTING
                                --------- ---------------------------------------------------------------------------
                                --------- --------------------------------------------------------------------------- --------------
         PERSON WITH            10        SHARED DISPOSITIVE POWER
                                             371,233
- ------------------------------- --------- --------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              371,233
- ---------- ----------------------------------------------------------------------------------------------------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                                                                               |-|
- ---------- ----------------------------------------------------------------------------------------------------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
              25.8%
- ---------- ----------------------------------------------------------------------------------------------------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
14         TYPE OF REPORTING PERSON*
              IN
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
</TABLE>
<PAGE>
<TABLE>
<S>     <C>
- ------------------------------------------------------                              ------------------------------------------------
                                                                   13D
CUSIP NO.  670088103                                                                PAGE 3 OF 21 PAGES
- ------------------------------------------------------                              ------------------------------------------------
</TABLE>

<TABLE>
<S>     <C>
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
1          NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
              Clinical Chemistry Holdings, Inc.                 I.R.S. Identification No.:  52-2202556
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                          (a)      |_|
                                                                                                                      (b)      |_|
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
3          SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
4          SOURCE OF FUNDS*
              WC
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)                              |_|
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
6          CITIZENSHIP OR PLACE OF ORGANIZATION
              Delaware
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
- ------------------------------- --------- --------------------------------------------------------------------------- --------------
                                7         SOLE VOTING POWER
          NUMBER OF
                                --------- ---------------------------------------------------------------------------
                                --------- --------------------------------------------------------------------------- --------------
            SHARES              8         SHARED VOTING POWER
         BENEFICIALLY                        371,233
                                --------- ---------------------------------------------------------------------------
                                --------- --------------------------------------------------------------------------- --------------
           OWNED BY             9         SOLE DISPOSITIVE POWER
        EACH REPORTING
                                --------- ---------------------------------------------------------------------------
                                --------- --------------------------------------------------------------------------- --------------
         PERSON WITH            10        SHARED DISPOSITIVE POWER
                                             371,233
- ------------------------------- --------- --------------------------------------------------------------------------- --------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              371,233
- ---------- ----------------------------------------------------------------------------------------------------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                                                                               |-|
- ---------- ----------------------------------------------------------------------------------------------------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
              25.8%
- ---------- ----------------------------------------------------------------------------------------------------------
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
14         TYPE OF REPORTING PERSON*
              CO
- ---------- ---------------------------------------------------------------------------------------------------------- --------------
</TABLE>

<PAGE>


Item 1.  Security and Issuer.

         The class of equity securities to which this statement relates is the
Common Stock, par value $.01 per share (the "Common Stock"), of Novitron
International, Inc., a Delaware corporation (the "Issuer"). The principal
executive offices of the Issuer are located at One Gateway Center, Suite 411,
Newton, Massachusetts 02158.

Item 2.  Identity and Background.

         (a)-(c) This statement is being filed on behalf of Mr. Randal J. Kirk
and Clinical Chemistry Holdings, Inc., a Delaware corporation that is controlled
by Mr. Kirk ("CCH" and, together with Mr. Kirk, the "Reporting Persons"). The
principal occupation/employment of Mr. Kirk is investor. The business address of
Mr. Kirk is c/o Third Security, LLC, The Governor Tyler, 1902 Downey Street,
Radford, Virginia 24141. CCH is a holding company for a variety of clinical
chemistry-related businesses, including its wholly-owned subsidiaries Landmark
Scientific, Inc. and Landmark Export Corporation. The address of CCH's principal
business and office is 101-B Creekridge Road, Greensboro, North Carolina 27406.
The name, address and present principal occupation of each of the directors and
executive officers of CCH are set forth in Appendix A attached hereto.

         (d)-(e) During the last five years, none of the Reporting Persons or,
to the best of the Reporting Persons' knowledge, any of the directors or
executive officers of the Reporting Persons has been convicted in a criminal
proceeding (excluding traffic violations or similar misdemeanors) or been a
party to a civil proceeding of a judicial or administrative body of competent
jurisdiction and as a result of such proceeding is or was subject to a judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, Federal or State securities laws or finding any
violation with respect to such laws.

         (f) Mr. Kirk is a citizen of the United States. Except as provided in
Appendix A attached hereto, each director and executive officer of CCH is a
citizen of the United States.

Item 3.  Source and Amount of Funds or Other Consideration.

         The Reporting Persons used an aggregate of approximately $1,053,457 in
cash to purchase the shares of Common Stock reported in Item 5(a) hereof. Mr.
Kirk used approximately $152,286 of personal funds to purchase 70,000 shares of
Common Stock. On November 9, 1999, Mr. Kirk transferred these 70,000 shares to
CCH in exchange for shares of preferred stock of CCH in a transaction valued at
$175,000, which amount reflected the fair value of the shares of Common Stock on
that date. CCH used approximately $901,171 of working capital to purchase the
remaining 301,233 shares of Common Stock.

                               Page 4 of 21 Pages
<PAGE>

Item 4.  Purpose of Transaction.

         The Reporting Persons' purpose in purchasing the Common Stock reported
in Item 5(a) hereof is for investment purposes and as described in the following
paragraph. The Reporting Persons, or any of them, may purchase additional shares
of Common Stock from time to time, either in the open market or in privately
negotiated transactions. Any decision of the Reporting Persons to increase their
holdings in Common Stock will depend, however, on numerous factors, including,
without limitation, the price of shares of Common Stock, the terms and
conditions related to their purchase and sale, the prospects and profitability
of the Issuer, other business and investment alternatives of the Reporting
Persons and general economic and market conditions. At any time, the Reporting
Persons, or any of them, may determine to dispose of some or all of their
holdings of Common Stock depending on those and other considerations.

         Except as set forth above, none of the Reporting Persons has any plans
or proposals that relate to or would result in (a) the acquisition by any person
of additional securities of the Issuer or the disposition of securities of the
Issuer; (b) an extraordinary corporate transaction, such as a merger,
reorganization or liquidation, involving the Issuer; (c) a sale or transfer of a
material amount of assets of the Issuer; (d) any change in the present board of
directors or management of the Issuer, including any plans or proposals to
change the number or term of directors or to fill any existing vacancies on the
board; (e) any material change in the present capitalization or dividend policy
of the Issuer; (f) any other material change in the Issuer's business or
corporate structure; (g) changes in the Issuer's charter, bylaws or instruments
corresponding thereto or other actions which may impede the acquisition of
control of the Issuer by any person; (h) causing a class of securities of the
Issuer to be delisted from a national securities exchange or to cease to be
authorized to be quoted in an interdealer quotation system of a registered
national securities association; (i) a class of equity securities of the Issuer
becoming eligible for termination of registration pursuant to Section 12(g)(4)
of the Securities Exchange Act of 1934; or (j) any action similar to any of
those enumerated above. CCH may formulate plans or proposals with respect to one
or more of the foregoing in the future.

Item 5.  Interest in Securities of the Issuer.

(a) The aggregate number and percentage of shares of Common Stock to which this
statement relates is 371,233 shares, representing 25.8% of the 1,439,925 shares
outstanding as reported by the Issuer on November 12, 1999 in the Issuer's
Quarterly Report on Form 10-Q for the quarter ended September 30, 1999 (the most
recent available filing by the Issuer with the Securities and Exchange
Commission). CCH beneficially owns all of the shares to which this statement
relates, and Mr. Kirk is deemed to have beneficial ownership of the shares owned
by CCH.

(b) Each of the Reporting Persons has, together with the other Reporting Person,
the shared power to vote or direct the vote and the shared power to dispose or
to direct the disposition of the shares of Common Stock reported by it or him in
Item 5(a) hereof.

                               Page 5 of 21 Pages
<PAGE>

(c) Appendix B attached hereto lists all transactions in shares of Common Stock
by the Reporting Persons that were effected during the past 60 days.

(d)      Not applicable.

(e)      Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

         On November 12, 1999, Mr. Kirk, CCH and Albert Investment Strategies,
Inc. ("Albert") entered into a letter agreement (as subsequently amended by
letter agreements dated November 24, 1999, November 26, 1999 and December 2,
1999, the "Agreement") pursuant to which CCH agreed to purchase from Albert, and
Albert agreed to sell to CCH, 185,533 shares of Common Stock owned by Albert and
various accounts over which Albert had dispositive power for the aggregate price
of $556,599 ($3.00 per share). The purchase and sale was consummated pursuant to
the terms and conditions of the Agreement on November 26, 1999.

         The Agreement provides that if, on or prior to November 26, 2001, Mr.
Kirk, CCH or any of his or its affiliates (collectively, the "CCH Group")
acquires more than 51% of the then outstanding voting securities of the Issuer
pursuant to a tender offer, an exchange offer, private purchases or a merger or
other business combination of the Issuer with any member of the CCH Group (a
"Realization Event"), then Mr. Kirk and CCH agree to pay to Albert within 10
days of the Realization Event an amount equal to the product of 185,533 and the
difference between the per share price paid in connection with the Realization
Event and $3.00.

         The Agreement also provides that, except with respect to the continued
beneficial ownership or the sale of shares of Common Stock held by Albert and
its affiliates on November 29, 1999 immediately following the consummation of
the transaction contemplated by the Agreement, neither Albert nor any of its
affiliates will purchase, beneficially own or control any shares of Common Stock
or otherwise trade in, or with respect to, the Common Stock through and
including November 26, 2001.

Item 7.  Material to be Filed as Exhibits.

         The following documents are being filed as exhibits to this Statement
and are each incorporated herein by reference:

         Exhibit 6.1       Letter agreement, dated November 12, 1999, by and
                           among Albert Investment Strategies, Inc., Clinical
                           Chemistry Holdings, Inc. and Randal J. Kirk.

         Exhibit 6.2       Letter agreement, dated November 24, 1999, by and
                           among Albert Investment Strategies, inc., Clinical
                           Chemistry Holdings, Inc. and Randal J. Kirk.

                               Page 6 of 21 Pages
<PAGE>

         Exhibit 6.3       Letter agreement, dated November 26, 1999, by and
                           among Albert Investment Strategies, Inc., Clinical
                           Chemistry Holdings, Inc. and Randal J. Kirk.

         Exhibit 6.4       Letter agreement, dated December 2, 1999, by and
                           among Albert Investment Strategies, Inc., Clinical
                           Chemistry Holdings, Inc. and Randal J. Kirk.

         Exhibit 7         Joint Filing Agreement.

                               Page 7 of 21 Pages

<PAGE>



                                    SIGNATURE

         After reasonable inquiry and to the best of their knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.




Date:  December 6, 1999               /s/ Randal J. Kirk
                                      ------------------------------------------
                                      Randal J. Kirk



Date:  December 6, 1999               CLINICAL CHEMISTRY HOLDINGS, INC.


                                      By: /s/ Audrey Ho Ping Ting
                                         --------------------------------------
                                          Audrey Ho Ping Ting
                                          President and Chief Executive Officer

                               Page 8 of 21 Pages
<PAGE>

                                                                 Appendix A



                      INFORMATION CONCERNING THE DIRECTORS
                          AND EXECUTIVE OFFICERS OF CCH

         The following tables set forth the name, business address, principal
occupation and material positions held within the past five years of each
director and executive officer of CCH. Each person has a business address at
101-B Creekridge Road, Greensboro, North Carolina 27406, and is a citizen of the
United States unless a different business address or citizenship is indicated
under his or her name.

<TABLE>
<CAPTION>
                                                                              PRINCIPAL OCCUPATION OR
  NAME AND CITIZENSHIP                  OFFICE(S)                      EMPLOYMENT DURING THE LAST FIVE YEARS
- -------------------------- ------------------------------------ ----------------------------------------------------
<S>     <C>
Randal J. Kirk             Director and Chairman                Chairman, Lotus Biochemical Corporation* (since
The Governor Tyler                                              1996); Manager, New River Management Company,
1902 Downey Street                                              L.L.C.* (since 1996); Managing Director, Third
Radford, VA 24141                                               Security, LLC (since 1999); Chairman, BCCX,
                                                                Inc.* (since 1998); Manager, Clinical Chemistry
                                                                Holdings, Inc.* (since 1999); Manager, SFR, LLC
                                                                (since 1998); Chairman, Biopop Integration
                                                                Group, Inc. (since 1999); Manager, Zhong Mei, LLC
                                                                (since 1999); Manager, JK, L.L.C (since 1994);
                                                                Manager, Kirkfield, L.L.C. (since 1994); Joint
                                                                Account Holder, Kirk Family Investment Plan (since
                                                                1998); former Chairman, General Injectables &
                                                                Vaccines, Inc.* (1994-1998); former Chairman and CEO,
                                                                Biological & Popular Culture, Inc.* (1995 to 1998).

Audrey Ho Ping Ting        Director, President and Chief        President and CEO, Clinical Chemistry Holdings,
Citizenship: Singapore     Executive Officer                    Inc. (since 1999); Managing Director, Third
                                                                Security, LLC (since 1999); CEO, Third Security Asia
                                                                Pte (since 1997); former Vice President, Business
                                                                Development, Lotus Biochemical (Bermuda) Ltd. (1996-1997);
                                                                former Strategic Development Manager, Mount Elizabeth
                                                                Hospital Pte Ltd, Singapore (1995-1996).

Marcus E. Smith            Director and Secretary               Managing Director, Third Security, LLC; Director,
The Governor Tyler                                              Lotus Biochemical Corporation, BCCX, Inc.,
1902 Downey Street                                              Clinical Chemistry Holding, Inc., Biopop
Radford, VA 24141                                               Integration Group, Inc. and subsidiaries and
                                                                affiliates; Manager, SFR, LLC; Former Senior Vice
                                                                President, General Counsel, Secretary, and Director,
                                                                Biological and Popular Culture, Inc., and its subsidiaries
                                                                and affiliates (through 1998).
</TABLE>

                               Page 9 of 21 Pages
<PAGE>
<TABLE>
<CAPTION>
                                                                              PRINCIPAL OCCUPATION OR
  NAME AND CITIZENSHIP                  OFFICE(S)                      EMPLOYMENT DURING THE LAST FIVE YEARS
- -------------------------- ------------------------------------ ----------------------------------------------------
<S>     <C>
Dixon D. Low               Director                             Managing Director, Third Security, LLC; Director,
The Governor Tyler                                              Lotus Biochemical Corporation; BCCX, Inc.;
1902 Downey Street                                              Clinical Chemistry Holding, Inc.; Biopop
Radford, VA 24141                                               Integration Group, Inc.; and subsidiaries and
                                                                affiliates; Manager, SFR, LLC; former Director of
                                                                Taxation, Biological & Popular Culture, Inc.
                                                                (1998); former Managing Director, Fariss, Feldmann
                                                                & Co., Investment Bankers (1997-1998); former Senior
                                                                Vice President, Chief Financial Officer, and Director,
                                                                Biological and Popular Culture, Inc., and its subsidiaries
                                                                and affiliates (1995-1997); former Director, Tax Practice,
                                                                KPMG LLP (through 1995).

Ronald W. Buchanan         Director                             President, BCCX, Inc. (including
                                                                subsidiaries/affiliates) (since 1998); President,
                                                                BioClinical Concepts, Inc. (since 1995); former
                                                                Vice President, Laboratory Markets, Biological &
                                                                Popular Culture, Inc. (1998); former Vice
                                                                President, Business Development, General
                                                                Injectables & Vaccines, Inc. (1996); former
                                                                Associate Vice President, New Business
                                                                Development, Roche Biomedical Laboratories
                                                                (LabCorp) (1989-1996).

Ronald Poe                 Vice President, Sales and Marketing  Vice President, Sales and Marketing, Clinical
                                                                Chemistry Holdings, Inc.; former Vice President,
                                                                Sales and Director of Sales, Landmark Scientific,
                                                                Inc. (1988-1999).
</TABLE>


*  Mr. Kirk is/was a director and officer of this entity and its subsidiaries
   and affiliates.

                              Page 10 of 21 Pages

<PAGE>

                                                                    Appendix B

                 TRANSACTIONS EFFECTED DURING THE PAST 60 DAYS*

<TABLE>
<CAPTION>
                                                               Shares Purchased                  Average Price
Reporting Person                           Date                       (Sold)                       Per Share**
- ------------------------------- ---------------------------- ---------------------------- ----------------------------
<S>     <C>
Mr. Kirk                                  10/7/99                          1,000                       $2.36
Mr. Kirk                                  10/8/99                            800                       $2.31
Mr. Kirk                                 10/12/99                          6,200                       $2.38
Mr. Kirk                                 10/13/99                          4,500                       $2.50
Mr. Kirk                                 10/14/99                          3,500                       $2.54
Mr. Kirk                                 10/15/99                          1,500                       $2.63
Mr. Kirk                                 10/19/99                          8,000                       $2.69
Mr. Kirk                                 10/21/99                          4,000                       $2.69
Mr. Kirk                                 10/25/99                          5,000                       $2.75
Mr. Kirk                                  11/9/99                        (70,000)***                   $2.50
CCH                                       11/9/99                         70,000***                    $2.50
CCH                                      11/26/99                         35,800                       $2.87
CCH                                      11/26/99                        185,533****                   $3.00
CCH                                      11/29/99                          8,600                       $2.98
CCH                                       12/1/99                          9,500                       $3.00
CCH                                       12/2/99                         56,500                       $3.00
CCH                                       12/3/33                          5,300                       $3.00
</TABLE>


*       Unless otherwise indicated, all transactions were effected on the
        Nasdaq.

**      Price excludes commission.

***     Contribution to the capital of CCH by Mr. Kirk in exchange for shares of
        preferred stock of CCH.

****    Privately negotiated agreement to purchase shares pursuant to a letter
        agreement, dated November 12, 1999 (as amended by letter agreements
        dated November 24, 1999, November 26, 1999 and December 2, 1999), by and
        among Albert Investment Strategies, Inc., CCH and Mr. Kirk.

                              Page 11 of 21 Pages

<PAGE>


                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit Number                                       Exhibit
- --------------                                       -------
<S>     <C>
Exhibit 6.1                Letter agreement, dated November 12, 1999, by and among Albert Investment Strategies,
                           Inc., Clinical Chemistry Holdings, Inc. and Randal J. Kirk.

Exhibit 6.2                Letter agreement, dated November 24, 1999, by and among Albert Investment Strategies,
                           Inc., Clinical Chemistry Holdings, Inc. and Randal J. Kirk.

Exhibit 6.3                Letter agreement, dated November 26, 1999, by and among Albert Investment Strategies,
                           Inc., Clinical Chemistry Holdings, Inc. and Randal J. Kirk.

Exhibit 6.4                Letter agreement, dated December 2, 1999, by and among Albert Investment Strategies,
                           Inc., Clinical Chemistry Holdings, Inc. and Randal J. Kirk.

Exhibit 7                  Joint Filing Agreement.
</TABLE>


                              Page 12 of 21 Pages

                                                                EXHIBIT 6.1


November 12, 1999


Mr. Randal J. Kirk
Chairman
Clinical Chemistry Holdings, Inc.
7335 Lee Highway
Radford, VA  24141


Dear Mr. Kirk:

This letter shall represent our legally binding agreement as follows:

1. Effective November 12, 1999 (the "Effective Date"), Albert Investment
Strategies, Inc. ("Albert") shall transfer to Clinical Chemistry Holdings, Inc.
("CCH"), all of the Common Stock of Novitron International, Inc. ("Novitron")
that is held by Albert and various accounts over which Albert has dispositive
power ("Shares"), which Shares total approximately 246,326. Such transfer shall
be effected as follows:

                  (a) Albert shall place an all or none limit sell order
                  for the Shares at $3.00 per Share; and

                  (b) CCH shall place an all or none limit buy order at $3.00
                  per share for the number of shares of Common Stock of Novitron
                  equal to the Shares.

"Closing" shall have occurred upon the completion of such transfer in the manner
described above in this paragraph. Upon Closing, paragraphs two, four, and five
of this letter shall be effective as of the Effective Date.

2. Both CCH and Randal Kirk, in his individual capacity, jointly and severally
agree that if there is a Realization Event (as defined herein) within a period
of two (2) years from the Effective Date, that they shall cause to be paid to
Albert, within ten (10) days of the Realization Event, an amount equal to the
product of the number of Shares transferred under this Agreement and the
difference between (i) the per share price in connection with the Realization
Event if such per share price is greater than $3.00 and (ii) $3.00 per share.
The term "Realization Event" shall meant the acquisition of additional shares of
Common Stock of Novitron by CCH, Randal J. Kirk, or any entity affiliated with
CCH or Randal J Kirk (collectively, "CCH Group") during such two (2) year period
sufficient to give the CCH Group control over fifty-one percent (51%) of the
then outstanding voting securities of Novitron pursuant to (i) a tender offer,

                              Page 13 of 21 Pages
<PAGE>

(ii) an exchange offer, (iii) one or more private purchases of additional shares
during such two-year period from one or more shareholders by the CCH Group, or
(iv) a merger or combination of Novitron with the CCH Group. In the event that
any portion of the consideration paid or received in connection with a
Realization Event shall not be entirely in cash, such non-cash portion shall be
valued at its market price on the date of the Realization Event or on such other
reasonable basis as the parties shall agree for purposes of determining the per
Share price in connection with the Realization Event. CCH and Kirby hereby agree
to furnish prompt written notice to Albert upon the occurrence of a Realization
Event.

3. This agreement has been duly authorized by each of the parties and
constitutes a valid and binding agreement. This Agreement shall be construed
under the laws of the State of Florida and the parties consent to jurisdiction
in the Federal and state courts of the State of Florida. This Agreement may be
executed in several counterparts, each of which shall constitute an original,
but all counterparts shall constitute but one and the same Agreement. This
Agreement shall be binding upon and shall inure to the benefit of the parties
hereto and their respective heirs, executors, administrators, legal
representatives, successors and permitted assigns. This Agreement may be
executed by facsimile signature.

4. Albert agrees that neither Albert nor any of its affiliates will purchase,
beneficially own or control any shares of Common Stock of Novitron or otherwise
trade in, or with respect to, the Common Stock of Novitron for a period of two
(2) years from the Effective Date.

5. Albert hereby represents and warrants to CCH that (i) Albert is not an
"affiliate" of Novitron as defined in Rule 144 under the Securities Act of 1933,
as amended ("Rule 144"), (ii) the Shares are not "restricted securities" as
defined in Rule 144, and (iii) upon payment for the Shares. CCH will acquire
good and valid title to the Shares, free and clear of all liens, claims, and
encumbrances.

         If you are in agreement with the above, please execute this Agreement
and return a signed copy to the undersigned at the address indicated above.

                       ALBERT INVESTMENT STRATEGIES, INC.


                                   By:      /s/ Ira Albert
                                        -------------------------------
                                            Ira Albert, President


                        CLINICAL CHEMISTRY HOLDINGS, INC.


                                   By:      /s/ Randal J. Kirk
                                        -------------------------------
                                            Randal J. Kirk, Chairman


                                            /s/ Randal J. Kirk
                                         ----------------------------------
                                            Randal J. Kirk, Individually

                              Page 14 of 21 Pages




                                                                   EXHIBIT 6.2


November 24, 1999


Mr. Randal J. Kirk
Chairman
Clinical Chemistry Holdings, Inc.
7335 Lee Highway
Radford, VA  24141


Dear Mr. Kirk:

         The letter agreement between Albert Investment Strategies, Inc.
("Albert"), Clinical Chemistry Holdings, Inc. ("CCH"), and Randal J. Kirk, dated
November 12, 1999 ("Letter Agreement"),  is modified and amended by the deletion
of the first  numbered  paragraph  thereof and the insertion of the following in
its place:

         1. Effective November 24, 1999 (the "Effective Date"), Albert
         Investment Strategies, Inc. ("Albert") shall transfer to Clinical
         Chemistry Holdings, Inc. ("CCH"), and CCH shall purchase from Albert,
         on an all or none basis, 185,533 shares of Common Stock of Novitron
         International, Inc. ("Novitron") held by Albert and various accounts
         over which Albert has dispositive power ("Shares"). The total
         consideration to be paid by CCH to Albert for the transfer of the
         Shares shall be Five Hundred Fifty-six Thousand Five Hundred
         Ninety-nine Dollars ($556,599.00), which is calculated on the basis of
         $3.00 per Share. Payment shall be made upon delivery of the Shares to
         the broker designated by CCH. "Closing shall have occurred upon
         completion of the delivery of the Shares and the payment therefor as
         described above. Upon Closing, paragraphs two, four, and five of this
         letter shall be effective as of the Effective Date.

         Except as modified and amended in this letter, the Letter Agreement
shall remain in full force and effect. If you are in agreement with the above,
please execute this amendment to the Letter Agreement and return a signed copy
to the undersigned at the address indicated above.

                       ALBERT INVESTMENT STRATEGIES, INC.


                                       By:      /s/ Ira Albert
                                            ---------------------------------
                                                Ira Albert, President

                              Page 15 of 21 Pages
<PAGE>

                        CLINICAL CHEMISTRY HOLDINGS, INC.


                                       By:      /s/ Randal J. Kirk
                                           ---------------------------------
                                                Randal J. Kirk, Chairman


                                                /s/ Randal J. Kirk
                                            ---------------------------------
                                                Randal J. Kirk, Individually

                              Page 16 of 21 Pages

                                                                    EXHIBIT 6.3

November 26, 1999


Mr. Randal J. Kirk
Chairman
Clinical Chemistry Holdings, Inc.
7335 Lee Highway
Radford, VA  24141


Dear Mr. Kirk:

         The letter agreement between Albert Investment Strategies, Inc.
("Albert"), Clinical Chemistry Holdings, Inc. ("CCH"), and Randal J. Kirk, dated
November  12,  1999,  and amended by letter  dated  November  24, 1999  ("Letter
Agreement"),  is  modified  and amended by the  deletion  of the first  numbered
paragraph thereof and the insertion of the following in its place:

         1. Effective November 26, 1999 (the "Effective Date"), Albert
         Investment Strategies, Inc. ("Albert") shall transfer to Clinical
         Chemistry Holdings, Inc. ("CCH"), and CCH shall purchase from Albert,
         on an all or none basis, 185,533 shares of Common Stock of Novitron
         International, Inc. ("Novitron") held by Albert and various accounts
         over which Albert has dispositive power ("Shares"). The total
         consideration to be paid by CCH to Albert for the transfer of the
         Shares shall be Five Hundred Fifty-six Thousand Five Hundred
         Ninety-nine Dollars ($556,599.00), which is calculated on the basis of
         $3.00 per Share. Payment shall be made upon delivery of the Shares to
         the broker designated by CCH. "Closing shall have occurred upon
         completion of the delivery of the Shares and the payment therefor as
         described above. Upon Closing, paragraphs two, four, and five of this
         letter shall be effective as of the Effective Date.

         Except as modified and amended in this letter, the Letter Agreement
shall remain in full force and effect. If you are in agreement with the above,
please execute this amendment to the Letter Agreement and return a signed copy
to the undersigned at the address indicated above.

                       ALBERT INVESTMENT STRATEGIES, INC.


                                       By:      /s/ Ira Albert
                                             -----------------------------
                                                Ira Albert, President

                              Page 17 of 21 Pages
<PAGE>

                        CLINICAL CHEMISTRY HOLDINGS, INC.


                                       By:      /s/ Randal J. Kirk
                                            -------------------------------
                                                Randal J. Kirk, Chairman


                                                /s/ Randal J. Kirk
                                            ---------------------------------
                                                Randal J. Kirk, Individually

                              Page 18 of 21 Pages


                                                                   EXHIBIT 6.4


December 2, 1999


Mr. Randal J. Kirk
Chairman
Clinical Chemistry Holdings, Inc.
7335 Lee Highway
Radford, VA  24141


Dear Mr. Kirk:

         The letter agreement between Albert Investment Strategies, Inc.
("Albert"), Clinical Chemistry Holdings, Inc. ("CCH"), and Randal J. Kirk, dated
November 12, 1999,  and amended by letters dated  November 24, 1999 and November
26, 1999 ("Letter Agreement"), is modified and amended, effective as of November
26,  1999,  by the  deletion of the fourth  numbered  paragraph  thereof and the
insertion of the following in its place:

         4. Other than with respect to the continued beneficial ownership or
         sale of shares of Common Stock of Novitron held by Albert and various
         accounts over which Albert has dispositive power on the Effective Date
         other than the Shares, Albert agrees that neither Albert nor any of its
         affiliates will purchase, beneficially own or control any shares of
         Common Stock of Novitron or otherwise trade in, or with respect to, the
         Common Stock of Novitron for a period of two (2) years from the
         Effective Date.

         Except as modified and amended in this letter, the Letter Agreement
shall remain in full force and effect. If you are in agreement with the above,
please execute this amendment to the Letter Agreement and return a signed copy
to the undersigned at the address indicated above.

                       ALBERT INVESTMENT STRATEGIES, INC.


                                      By:      /s/ Ira Albert
                                           ----------------------------------
                                               Ira Albert, President


                        CLINICAL CHEMISTRY HOLDINGS, INC.


                                      By:      /s/ Randal J. Kirk
                                           -----------------------------------
                                               Randal J. Kirk, Chairman

                              Page 19 of 21 Pages
<PAGE>

                                               /s/ Randal J. Kirk
                                             ---------------------------------
                                               Randal J. Kirk, Individually

                              Page 20 of 21 Pages


                                                                     EXHIBIT 7

                             JOINT FILING AGREEMENT


         In accordance with Rule 13d-1(f) promulgated under the Securities
Exchange Act of 1934, as amended, the persons names below agree to the joint
filing on behalf of each of them a Statement on Schedule 13D (including
amendments thereto) with regard to the common stock of Novitron International,
Inc., and further agree that this Joint Filing Agreement be included as an
Exhibit to such joint filings. In evidence thereof, the undersigned, being duly
authorized, hereby execute this agreement as of the 6th day of December, 1999.




Date:  December 6, 1999             /s/ Randal J. Kirk
                                    --------------------------------------------
                                    Randal J. Kirk



Date:  December 6, 1999             CLINICAL CHEMISTRY HOLDINGS, INC.


                                    By: /s/ Audrey Ho Ping Ting
                                       ----------------------------------------
                                        Audrey Ho Ping Ting
                                        President and Chief Executive Officer




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